TWI712245B - Charge control circuit using battery voltage tracking, and a device having the same - Google Patents

Abstract

A charge control circuit includes: a charge current control circuit configured to receive an input voltage at a first node, output a sensing current to a second node, and turn on a power transistor; a comparator configured to compare a voltage level of the second node with a voltage level of a third node, wherein the third node receives a charging current from the power transistor; a current mirror configured to generate a mirror current corresponding to the sensing current; and an amplifier configured to receive a first feedback voltage based on the mirror current, and amplify a difference between the first feedback voltage and a reference voltage to generate a switch control signal, wherein in response to the switch control signal and a plurality of control signals, the charge current control circuit is configured to decrease the sensing current and turn on the power transistor.

Description

Charge control circuit using battery voltage tracking and Circuit device

The exemplary embodiment of the inventive concept relates to a semiconductor device, and more specifically, to a charging control circuit and a device having the circuit.

[Cross reference of related applications]

This application claims the priority of Korean Patent Application No. 10-2015-0111357 filed on August 7, 2015 and U.S. Patent Application No. 15/096,687 filed on April 12, 2016, so The full text of the aforementioned patent application is incorporated into this case for reference.

Wearable devices such as smart watches are increasingly being developed. Wearable devices are generally smaller than smart phones. Wearable devices generally use batteries with small capacity. Therefore, the battery of the wearable device is frequently charged. Generally speaking, an additional charging device is used to charge the battery of the wearable device.

The charging device generally includes: a charging circuit, which charges the battery; and a step-down switching direct current (DC)-DC converter, which adjusts the power supplied to the charging circuit to increase the charging efficiency of the battery. The charging efficiency of the battery depends on the ratio of the input voltage to the output voltage of the charging circuit. As the difference between the input voltage and the output voltage of the charging circuit increases, the charging efficiency of the battery decreases. Therefore, in order to reduce the difference between the input voltage and the output voltage, a step-down switching DC-DC converter is used in the charging device. However, since the step-down switching DC-DC converter includes a capacitor and an inductor, the step-down switching DC-DC converter has a large size and therefore the size of the charging device increases. Therefore, the step-down switching DC-DC converter can increase the size of the wearable device.

According to an exemplary embodiment of the inventive concept, a charging control circuit includes: a charging current control circuit to receive an input voltage at a first node, output a sensed current to a second node, and turn on a power transistor; compare A device for comparing the voltage level of the second node with the voltage level of a third node, wherein the third node receives a charging current from the power transistor; a current mirror is used to generate a The mirror current of the sensing current; and an amplifier for receiving a first feedback voltage based on the mirror current, and amplifying the difference between the first feedback voltage and a reference voltage to generate a switching control signal, wherein Based on the switch control signal and a plurality of control signals, the charging current control circuit is used to reduce the sensing current and turn on the power transistor.

The charging current control circuit may include multiple transistors and multiple switches.

The number of the transistors to be turned on may depend on the control signals.

The values of the plurality of control signals may depend on the voltage level at the third node.

When the sensing current decreases, the voltage of the switch control signal may decrease.

When the voltage of the switch control signal decreases, the power transistor can be completely turned on.

The multiple control signals can be provided from the control circuit to the charging control circuit.

The output of the comparator may be provided to the current mirror via a plurality of transistors.

The amplifier may include a multiplexer, a first input terminal for receiving the reference voltage, a second input terminal for receiving the first feedback voltage, and a third input for receiving a second feedback voltage Terminals, and comparators.

When the first feedback voltage is greater than the second feedback voltage, the first feedback voltage may be transmitted to the input terminal of the comparator via the multiplexer for comparison with the reference voltage .

The first feedback voltage may be transmitted in a constant current mode via the multiplexer.

The charging control circuit may further include: a control signal generator connected to the output terminal of the power transistor, and used to control the signal according to the The voltage at the output terminal generates a control signal.

The input voltage may have a first current level, the sensing current may have a second current level greater than the first current level, and the first current level of the input voltage may be such that The power transistor is partially turned on.

The power transistor can be completely turned on by reducing the sensing current, and the sensing current is reduced by reducing the number of turned-on transistors in the charging current control circuit.

According to an exemplary embodiment of the inventive concept, a charging control circuit for supplying a charging voltage to a battery is provided. The charging control circuit includes: an input terminal for receiving an input voltage from a rectifier circuit; and an output terminal connected to the battery, wherein the charging control circuit is used for controlling the input voltage so that the input voltage can track the input voltage.述Charging voltage.

The charging control circuit further includes: a power transistor connected to the output terminal to provide the charging voltage to the battery; a comparator having a first input terminal connected to the power transistor and connected to the power transistor The second input terminal of the node of the charging current control circuit, wherein the sensing current of the charging current control circuit is input to the first input terminal of the comparator via the node; a current mirror is connected to the The output terminal of the comparator is used to generate a mirror current corresponding to the sensing current; and an amplifier is used to receive a reference voltage, a first feedback voltage, and a second feedback voltage, and the amplifier is based on the reference voltage The difference between the first feedback voltage or the reference voltage and the second feedback voltage outputs a switch control signal.

The charging current control circuit may include a plurality of transistors, and the plurality of transistors are turned on in response to the switch control signal.

The charging current control circuit may include a plurality of switches, and the plurality of switches are turned on in response to a control signal provided by a control signal generator.

The charging control circuit may further include at least one transistor connected between the output terminal of the comparator and the current mirror.

The input terminal of the at least one transistor may be connected to the node of the charging current control circuit, and the control terminal of the at least one transistor is connected to the output terminal of the comparator.

The second feedback voltage may be generated by a voltage divider connected to the output terminal of the power transistor.

The amplifier may include a multiplexer for supplying the first feedback voltage to the comparison circuit when the first feedback voltage is greater than the second feedback voltage.

The charging control circuit may further include: a control signal generator connected to the power transistor and used for generating a control signal according to the charging voltage provided from the power transistor.

According to an exemplary embodiment of the inventive concept, a device includes: a rectifier circuit for rectifying an alternating current (AC) signal received by the device into a direct current (DC) signal and outputting the direct current signal as an input voltage A charging control circuit for outputting a charging voltage based on the input voltage, wherein the charging control circuit is directly connected to the rectifier circuit to receive the input power And wherein the input voltage is controlled by the charging control circuit to track the charging voltage during the charging cycle; and a control circuit for controlling the rectifier circuit, the charging control circuit includes: a charging current control circuit, For receiving the input voltage, outputting the sensing current, and turning on the power transistor; and an amplifier for receiving the first feedback voltage and amplifying the difference between the first feedback voltage and the reference voltage to Generate switch control signal.

The device may further include a matching circuit to receive power from the smart phone in a wireless manner.

The device may be a wearable device.

The device can be charged while communicating with the smart phone wirelessly.

100, 100A, 100B: wireless charging system

110: The first graphical user interface

112: The second graphical user interface

120: The third graphical user interface

122: The fourth graphical user interface

200: First mobile device/mobile device

200A, 200B: the first mobile device

210: Modulation control circuit/component

220: Modulation circuit/component

230: matching circuit/component

240: antenna/component

250: Communication circuit/component

255: memory/component

260: Control circuit/component

270: Interface Circuit

271: User input

300: Second mobile device/mobile device/wearable IoT device/first IoT device

300A, 300B, 300C, 300D: second mobile device

301: Antenna/Component

303: matching circuit/component

305: Rectifier circuit/component

307: capacitor/component

309: charge control circuit/component

309C: Charging control circuit/component

310: Three-input amplifier

311: Constant current source

313: Multiplexer

313-1, 313-2: Transistor

315: Amplifier

316-1, 316-2: Transistor

317-1, 317-2: Transistor

318-1~318~8: Transistor

320: charging current control circuit

321: Current Source

321-1~321-3, 321-k: Transistor

323-1~323-3, 323-k: switch/metal oxide semiconductor field effect transistor switch

325: sensing circuit

327: Comparator

328-1, 328-2: Transistor/N-type metal oxide semiconductor field effect transistor

329-1, 329-2: Transistor

330: resistor/resistor

331: Current Source

332: resistor/resistor

335: control signal generator

340, 340B: communication circuit/component

350: control circuit/component

350C, 350D: control circuit

370: battery/component

380: Interface circuit/component

381: User input

385: memory/component

401: mobile devices/wearable IoT devices

401-1: Smart glasses

401-2: Headphone

401-3: ECG measuring instrument/photoplethysmography measuring instrument

401-4: Belt

401-6: Blood glucose meter/blood glucose concentration tester

401-7: temperature controlled clothing

401-8: shoes

401-9: Necklace

403: User

500: wireless charging system

510: Wearable IoT device/Second IoT device

520: Wearable IoT device / Third IoT device

530: Wearable IoT device / Fourth IoT device

540: Wearable IoT device/Fifth IoT device

550: Wearable IoT device/Sixth IoT device

560: Wearable IoT device / Seventh IoT device

570: Wearable IoT device / Eighth IoT device

580: Wearable IoT device/Ninth IoT device

APP1: The first application/application

APP2: second application/application

C1~C3, Ck: control signal

CC: Constant current mode

CS: output signal/switch control signal

CV: Constant voltage mode

I: sense current/mirror current

ICH: charging current

IFB: Input signal/second feedback voltage

ND0: Input terminal

ND1: Connect node

ND2: Resistor connection terminal

ND3: Divide nodes

ND4: output terminal/output node

PC: Precharge mode

PTR: output transistor

RCTRL: Rectifier control signal

REXT: resistance/resistor

S110, S120, S130, S130-1, S140, S150: steps

S210, S220, S230, S240, S240-1, S250, S260: steps

T1: the first time

T2: second time

T3: third time

VBAT: output voltage/charge voltage

VFB: Input signal/first feedback voltage

VIN: output voltage/input voltage

VREF: Reference voltage/input signal

VSS: voltage

The above-mentioned and other features of the inventive concept will become more obvious by explaining the exemplary embodiments of the inventive concept in detail with reference to the accompanying drawings. In the accompanying drawings: FIG. 1 shows a wireless device according to an exemplary embodiment of the inventive concept. A block diagram of a charging system. The wireless charging system includes a second mobile device that can be charged using a wireless signal output from the first mobile device.

FIG. 2 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept.

FIG. 3 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept.

FIG. 4 shows a block diagram of a charging control circuit included in the second mobile device shown in FIG. 2 or FIG. 3 according to an exemplary embodiment of the inventive concept.

FIG. 5 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept.

FIG. 6 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept.

FIG. 7 shows a block diagram of a charging control circuit included in the second mobile device shown in FIG. 5 or FIG. 6 according to an exemplary embodiment of the inventive concept.

FIG. 8 is a graph according to an exemplary embodiment of the inventive concept, which shows changes in input voltage and output current of the charging control circuit shown in FIG. 2, FIG. 3, FIG. 5, or FIG.

FIG. 9 is a block diagram of the three-input amplifier shown in FIG. 4 or FIG. 7 according to an exemplary embodiment of the inventive concept.

FIG. 10 is a detailed block diagram of the three-input amplifier shown in FIG. 9 according to an exemplary embodiment of the inventive concept.

FIG. 11 is a flowchart illustrating the operation of the second mobile device shown in FIG. 2 or FIG. 5 according to an exemplary embodiment of the inventive concept.

FIG. 12 is a flowchart illustrating the operation of the second mobile device shown in FIG. 3 or FIG. 6 according to an exemplary embodiment of the inventive concept.

FIG. 13 is a flowchart illustrating the operation of the second mobile device shown in FIG. 2 or FIG. 5 according to an exemplary embodiment of the inventive concept.

FIG. 14 is an exemplary embodiment according to the concept of the present invention, illustrating that in FIG. 3 or FIG. 6 The flow chart of the operation of the second mobile device is shown.

FIG. 15 shows a block diagram of a wireless charging system according to an exemplary embodiment of the inventive concept, the wireless charging system having a mobile device that can be charged using a wireless signal output from the first mobile device shown in FIG. 1.

FIG. 16 shows a block diagram of a wireless charging system according to an exemplary embodiment of the inventive concept. The wireless charging system includes a mobile device that can be charged using a wireless signal output from the first mobile device shown in FIG. 1.

1 shows a block diagram of a wireless charging system according to an exemplary embodiment of the inventive concept. The wireless charging system includes a second mobile device that can be charged using a wireless signal output from a first mobile device. 1, the wireless charging system 100 may include a first mobile device 200 and a second mobile device 300. For example, the first mobile device 200 may be a wireless power transmitting device, and the second mobile device 300 may be a wireless power receiving device.

The first mobile device 200 may use wireless power transfer (WPT) or wireless energy transmission (wireless energy transmission) to wirelessly transmit power to the second mobile device 300. Wireless power technologies can include inductive coupling, resonant inductive coupling, and capacitive coupling. Each of the mobile device 200 and the mobile device 300 may include an antenna for wireless power transfer or wireless energy transmission.

For example, the first mobile device 200 can use a wireless local area network (wireless local area network, WLAN) (for example, wireless fidelity (Wi-Fi)), wireless personal area network (wireless personal area network, WPAN) (for example, Bluetooth), wireless universal serial bus ( A universal serial bus (USB), Zigbee (Zigbee), near field communication (NFC), or radio-frequency identification (RFID) is used to transmit wireless power to the second mobile device 300. For example, the first mobile device 200 can supply wireless power to the second mobile device 300 in a non-contact manner. In other words, power can be supplied from the first mobile device 200 to the second mobile device 300 without a physical connection between the mobile device 200 and the mobile device 300.

The mobile device according to the exemplary embodiment of the inventive concept may be a small computing device, such as a handheld computer having a display screen and including a touch input device and a compact keyboard. For example, a mobile device may include an operating system (OS) and a processor that can execute the operating system, and the operating system and/or the processor can execute various types of “apps”. Type of application software. The mobile device may include an antenna, a communication circuit, or a communication module for connecting with the Internet or other mobile devices. The mobile device may include a camera or a multimedia player, and may include a rechargeable battery, such as a lithium battery. In addition, the mobile device may include sensors (eg, accelerometer, compass, magnetometer, and/or gyroscope) for detecting direction and/or detecting movement.

For example, the mobile device can be a laptop, mobile phone, smart phone, tablet personal computer (PC), personal digital assistant (personal digital assistant, PDA), enterprise digital assistant (EDA), digital camera, digital video camera, portable multimedia player (PMP), personal navigation device or portable navigation device (personal navigation device/portable navigation device (PND), handheld game consoles, mobile internet device (MID), wearable computers, Internet of things (IoT) devices, internet of everything, IoE) device, drone, or e-book.

The first mobile device 200 may include a first application APP1 for controlling wireless charging and wireless communication of the second mobile device 300. The first application APP1 can display a first graphical user interface (GUI) 110 for controlling wireless charging and a second graphical user interface 112 for controlling wireless communication via a display (or display device).

For example, when the user of the first mobile device 200 selects (or touches) the first graphical user interface 110, the first mobile device 200 can generate a wireless communication signal for wirelessly charging the second mobile device 300 (Or wireless charging signal), and transmit the generated wireless communication signal to the second mobile device 300. When the user of the first mobile device 200 selects (or touches) the second graphical user interface 112, the first mobile device 200 can transmit the wireless communication signal for wireless communication with the second mobile device 300 to the second The mobile device 300 may receive the wireless communication signal from the second mobile device 300.

The second mobile device 300 can communicate wirelessly with the first mobile device 200 The wireless charging operation is performed synchronously at the same time. The second mobile device 300 may include a second application APP2 for controlling wireless charging from the first mobile device 200 and wireless communication with the first mobile device 200. The second application APP2 can display a third graphical user interface 120 for controlling wireless charging and a fourth graphical user interface 122 for controlling wireless communication on the display (or display device).

For example, when the user of the second mobile device 300 selects or touches the third graphical user interface 120, the second mobile device 300 can use the wireless communication signal transmitted from the first mobile device 200 to communicate with the second mobile device 300 Charge the battery. When the user of the second mobile device 300 selects or touches the fourth graphical user interface 122, the second mobile device 300 can transmit wireless communication signals for wireless communication with the first mobile device 200 to the first mobile device 200 or receive the wireless communication signal from the first mobile device 200.

According to an exemplary embodiment of the inventive concept, at least one of the application APP1 and the application APP2 may be installed in at least one of the mobile device 200 and the mobile device 300. In addition, the user of each of the mobile device 200 and the mobile device 300 can download each of the application APP1 and the application APP2 from the application store for installation; however, the concept of the present invention is not limited to this.

FIG. 1 shows a smart phone as an example of the first mobile device 200 and a smart watch as an example of the second mobile device 300. However, the concept of the present invention is not limited to this, and the mobile device 200 and the mobile device 300 can undergo various changes.

FIG. 2 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept.

1 and 2, the wireless charging system 100A may include a first mobile device 200A and a second mobile device 300A. In FIG. 2, it is assumed that only the second application APP2 is installed in the second mobile device 300A. Therefore, whether to wirelessly charge the second mobile device 300A may depend on the user of the second mobile device 300A.

The first mobile device 200A may include a modulation control circuit 210, a modulation circuit 220, a matching circuit 230, an antenna 240, a communication circuit 250, a memory 255, and a control circuit 260.

The modulation control circuit 210 can control the modulation operation of the modulation circuit 220 according to the control of the control circuit 260. The modulation circuit 220 can modulate the carrier wave based on the data to be transmitted to the second mobile device 300A according to the control of the modulation control circuit 210.

The matching circuit 230 may be connected to the antenna 240 in parallel to form a resonance circuit. For example, the matching circuit 230 may include a capacitor. The antenna 240 can transmit the modulation signal output from the self-modulation circuit 220 to the second mobile device 300A. For example, the antenna 240 may be a coil antenna; however, the antenna 240 is not limited to this.

The wireless signal received from the second mobile device 300A can be transmitted to the communication circuit 250 via the antenna 240 and the matching circuit 230. The communication circuit 250 can wirelessly communicate with the second mobile device 300A via the antenna 240. The control circuit 260 may be a processor or a central processing unit (CPU) that can execute programs for wireless communication.

The memory 255 can store data (or programs) used for the operation of the first mobile device 200A. For example, the memory 255 may include volatile memory and non-volatile memory. For example, the volatile memory can be stored at the control circuit 260 The data processed or processed by the control circuit 260; however, the volatile memory is not limited to this. Volatile memory can be random access memory (RAM), dynamic random access memory (dynamic RAM, DRAM), or static random access memory (static RAM, SRAM); however, volatile Memory is not limited to this. The non-volatile memory can store startup images or programs to be executed by the control circuit 260; however, the non-volatile memory is not limited to this.

The second mobile device 300A may include an antenna 301, a matching circuit 303, a rectifier circuit 305, a capacitor 307, a charging control circuit 309, a communication circuit 340, a control circuit 350, a battery 370, an interface circuit 380, and a memory 385.

The semiconductor device may include a matching circuit 303, a rectifier circuit 305, a charging control circuit 309, a communication circuit 340, and a control circuit 350. According to exemplary embodiments of the inventive concept, the semiconductor device may further include an interface circuit 380 and a memory 385. The semiconductor device may include an integrated circuit (IC), a system on chip (SoC), a semiconductor package, or a module; however, the semiconductor device is not limited to this.

The antenna 301 can use the alternating magnetic field generated by the antenna 240 of the first mobile device 200A to generate an electromotive force, such as an alternating current (AC) signal. For example, the antenna 301 may be a coil antenna; however, the antenna 301 is not limited to this.

The matching circuit 303 may be connected to the antenna 301 in parallel to form a resonance circuit. For example, the matching circuit 303 may include a capacitor.

The rectifier circuit 305 can correspond to the rectifier output from the control circuit 350 The control signal RCTRL is enabled or disabled. For example, when the rectifier circuit 305 is energized, the rectifier circuit 305 can rectify the AC signal obtained by the antenna 301 into a direct current (DC) signal (VIN).

The capacitor 307 can perform a charging operation based on the output voltage VIN of the rectifier circuit 305. For example, the capacitor 307 can store the charge corresponding to the output voltage VIN of the rectifier circuit 305.

The charging control circuit 309 can charge the battery 370 based on the output voltage VIN of the rectifier circuit 305. For example, the charging control circuit 309 may use a voltage related to the output voltage VIN of the rectifier circuit 305 (for example, the voltage (or charged) charged in the capacitor 307) to charge the battery 370. The charging control circuit 309 can use the energy stored in the capacitor 307 or extract energy from the capacitor 307 so that the output current is greater than the input current.

The input terminal of the charging control circuit 309 is directly connected to the output terminal of the rectifier circuit 305. Therefore, the second mobile device 300A does not include an additional voltage regulator (for example, a DC-DC converter, a step-down converter, a buck converter, a low-dropout (LDO) regulator) To reduce the output voltage VIN of the rectifier circuit 305.

Therefore, the charging control circuit 309 of the second mobile device 300A does not include a voltage regulator, so that the area (or layout size) of the charging control circuit 309 can be reduced.

The charging control circuit 309 may control the input voltage VIN so that the input voltage VIN input to the input terminal of the charging control circuit 309 tracks the output voltage VBAT (for example, the charging voltage) supplied to the battery 370. As shown in Figure 8, charging The control circuit 309 can control the level of the input voltage VIN so that the level of the input voltage VIN input to the charging control circuit 309 uses a self-tracking technique to track or follow the level of the output voltage VBAT. For example, the charging control circuit 309 can perform the function of a linear charger.

In other words, the charging control circuit 309 can make the input voltage VIN track the charging voltage VBAT using a self-tracking technique, so that the charging control circuit 309 can charge the battery 370 with high charging efficiency without using a voltage regulator.

The wireless signal output from the first mobile device 200A can be transmitted to the communication circuit 340 via the antenna 301 and the matching circuit 303. The communication circuit 340 can wirelessly communicate with the first mobile device 200A via the antenna 301. The control circuit 350 can be a processor or a central processing unit that can execute a program for wireless communication. The control circuit 350 can execute the second application APP2.

When the user of the second mobile device 300A selects or touches the third graphical user interface 120 or the fourth graphical user interface 122 displayed on the display by the second application APP2, the interface circuit 380 can compare with the third graphical user interface The user input 381 related to the selection of the user interface 120 or the fourth graphical user interface 122 is sent to the control circuit 350.

For example, when the user of the second mobile device 300A selects the third graphical user interface 120, the interface circuit 380 may send the user input 381 related to the selection of the third graphical user interface 120 to the control circuit 350 . The control circuit 350 can control the rectifier circuit 305 and the communication circuit 340 to control wireless charging. Therefore, the rectifier circuit 305 can be energized in response to the rectifier control signal RCTRL, Moreover, the communication circuit 340 can be disabled according to the control of the control circuit 350. Therefore, the rectifier circuit 305 can rectify the AC signal obtained by the antenna 301 into a DC signal VIN.

When the battery 370 is fully charged, the control circuit 350 can automatically change the operation mode from the wireless charging mode for wireless charging to the wireless communication mode for wireless communication. It can be determined that the battery 370 is fully charged according to the charging voltage VBAT.

When the user of the second mobile device 300A selects the fourth graphical user interface 122, the interface circuit 380 may transmit the user input 381 related to the selection of the fourth graphical user interface 122 to the control circuit 350. The control circuit 350 can control the rectifier circuit 305 and the communication circuit 340 to control wireless communication. Therefore, the rectifier circuit 305 can be disabled in response to the rectifier control signal RCTRL, and the communication circuit 340 can be enabled according to the control of the control circuit 350. Therefore, the communication circuit 340 can wirelessly communicate with the first mobile device 200A via the antenna 301.

According to an exemplary embodiment of the inventive concept, if the user of the second mobile device 300A selects the third graphical user interface 120 or the fourth graphical user interface 122, wireless charging and wireless communication can be performed simultaneously or in parallel. The control circuit 350 can maintain each of the rectifier circuit 305 and the communication circuit 340 in an enabled state to perform wireless communication and wireless charging simultaneously or in parallel.

The memory 385 can store data (or programs) used for the operation of the second mobile device 300A. For example, the memory 385 may include volatile memory and non-volatile memory. For example, the volatile memory can be stored at the control circuit 350 The data that has been processed or processed by the control circuit 350; however, the volatile memory is not limited to this. The volatile memory can be random access memory, dynamic random access memory, or static random access memory; however, volatile memory is not limited to this. The non-volatile memory can store startup images or programs to be executed by the control circuit 350; however, the non-volatile memory is not limited to this.

FIG. 3 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept.

1 and 3, the wireless charging system 100B may include a first mobile device 200B and a second mobile device 300B. In FIG. 3, it is assumed that only the first application APP1 is installed in the first mobile device 200B. Therefore, whether to wirelessly charge the second mobile device 300B may depend on the user of the first mobile device 200B.

The first mobile device 200B may include a modulation control circuit 210, a modulation circuit 220, a matching circuit 230, an antenna 240, a communication circuit 250, a memory 255, a control circuit 260, and an interface circuit 270. The control circuit 260 can execute the first application APP1 according to the user input 271 input through the interface circuit 270. For example, the interface circuit 270 can be a touch screen or a touch screen controller; however, the interface circuit 270 is not limited to this.

When the user of the first mobile device 200B selects or touches the first graphical user interface 110 or the second graphical user interface 112 displayed on the display by the first application APP1, the interface circuit 270 can compare the first graphical user interface with The user input 271 related to the selection of the user interface 110 or the second graphical user interface 112 is sent to the control circuit 260.

For example, when the user of the first mobile device 200B selects the first graphical user interface 110, the interface circuit 270 may send the user input 271 related to the selection of the first graphical user interface 110 to the control circuit 260 . The control circuit 260 can control the modulation control circuit 210 and the communication circuit 250 to control wireless charging. When the modulation control circuit 210 controls the modulation circuit 220 to perform wireless charging, the modulation circuit 220 can transmit a wireless signal (for example, an unmodulated wireless signal) for wireless charging to the second action via the antenna 240 Device 300B; however, the wireless signal is not limited to this. According to exemplary embodiments of the inventive concept, the type or format of the wireless signal used for wireless charging can be variously changed.

When the user of the first mobile device 200B selects the second graphical user interface 112, the interface circuit 270 may transmit the user input 271 related to the selection of the second graphical user interface 112 to the control circuit 260. The control circuit 260 can control the modulation control circuit 210 and the communication circuit 250 to control wireless communication. When the modulation control circuit 210 controls the modulation circuit 220 to perform wireless communication, the modulation circuit 220 may modulate the carrier wave based on the data to be transmitted to the second mobile device 300B.

Except for operations related to the operation of the interface circuit 270, each of the components 210, 220, 230, 240, 250, 255, and 260 shown in FIG. 3 is the same as or similar to that shown in FIG. 2 in operation and function Each of the components 210, 220, 230, 240, 250, 255, and 260.

The second mobile device 300B may include an antenna 301, a matching circuit 303, a rectifier circuit 305, a capacitor 307, a charging control circuit 309, a communication circuit 340B, a control circuit 350, a battery 370, and a memory 385. Semiconductor device may include matching circuit Circuit 303, rectifier circuit 305, charging control circuit 309, communication circuit 340B, and control circuit 350. According to an exemplary embodiment of the inventive concept, the semiconductor device may further include a memory 385. The semiconductor device may include an integrated circuit, a system chip, a semiconductor package or a module; however, the semiconductor device is not limited to this.

The communication circuit 340B can receive and interpret the AC signal acquired by the antenna 301, determine whether the AC signal is an AC signal for wireless charging or an AC signal for wireless communication, and select a mode corresponding to the result of the determination The signal is sent to the control circuit 350.

For example, when the user of the first mobile device 200B selects the first graphical user interface 110, the communication circuit 340B can generate a mode for controlling the rectifier circuit 305 and the communication circuit 340B in response to the AC signal used for wireless charging Select the signal. Therefore, the control circuit 350 can generate the rectifier control signal RCTRL in response to the mode selection signal. The rectifier circuit 305 can be enabled in response to the rectifier control signal RCTRL, and the communication circuit 340B can be disabled according to the control of the control circuit 350. Therefore, the rectifier circuit 305 can rectify the AC signal obtained by the antenna 301 into a DC signal VIN.

When the battery 370 is fully charged, the control circuit 350 can automatically change the operation mode from the wireless charging mode for wireless charging to the wireless communication mode for wireless communication. It can be determined that the battery 370 is fully charged according to the charging voltage VBAT.

When the user of the first mobile device 200B selects the second graphical user interface 112, the communication circuit 340B can be produced in response to the AC signal used for wireless communication A mode selection signal for controlling the rectifier circuit 305 and the communication circuit 340B is generated. Therefore, the control circuit 350 can generate the rectifier control signal RCTRL in response to the mode selection signal. The rectifier circuit 305 can be disabled in response to the rectifier control signal RCTRL, and the communication circuit 340B can be maintained in the enabled state under the control of the control circuit 350. The communication circuit 340B can wirelessly communicate with the first mobile device 200B via the antenna 301.

According to an exemplary embodiment of the inventive concept, if the user of the first mobile device 200B selects the first graphical user interface 110 or the second graphical user interface 112, the communication circuit 340B can respond to the communication output from the matching circuit 303 Signal to generate a control signal. The control circuit 350 enables the rectifier circuit 305 and the communication circuit 340B to be enabled in response to the control signal. Therefore, the second mobile device 300B can perform wireless charging and wireless communication simultaneously or in parallel.

Except for operations related to the operation of the communication circuit 340B, each of the components 301, 303, 305, 307, 309, 350, 370, and 385 shown in FIG. 3 is the same as or similar to FIG. 2 in operation and function. Each of the components 301, 303, 305, 307, 309, 350, 370, and 385 shown.

The function of each of the reference voltage VREF and the resistance REXT shown in FIGS. 2 and 3 will be explained with reference to FIG. 4. For example, the reference voltage VREF can be generated by the reference voltage generator included in the second mobile device 300B. For example, the reference voltage generator may be a bandgap reference voltage generator; however, the reference voltage generator is not limited to this. The band gap reference voltage generator can generate a reference voltage independent of temperature. Resistor REXT can be placed in charge control External resistance outside of circuit 309.

FIG. 4 shows a block diagram of a charging control circuit included in the second mobile device shown in FIG. 2 or FIG. 3 according to an exemplary embodiment of the inventive concept.

2, 3, and 4, the charging control circuit 309 can control the charging current ICH for charging the battery 370 so that the charging current ICH is higher than the current supplied from the rectifier circuit 305 or the capacitor 307 to reduce the level of the input voltage VIN Reduce to the level of the output voltage VBAT. In this case, the output transistor PTR (for example, power transistor) is completely turned on by the internal feedback of the charging control circuit 309, so that the input terminal ND0 of the charging control circuit 309 receiving the input voltage VIN and outputting the output voltage The output terminal ND4 of VBAT can be short-circuited.

When the output voltage VBAT of the output terminal ND4 is low, the input voltage VIN of the input terminal ND0 automatically decreases. If the output transistor PTR is completely turned on, the input voltage VIN of the input terminal ND0 is not lower than the output voltage VBAT of the output terminal ND4 due to the on-resistance of the output transistor PTR. Therefore, as shown in FIG. 8, the level of the input voltage VIN changes according to the level of the output voltage VBAT. In other words, the level of the input voltage VIN can track the level of the output voltage VBAT.

FIG. 8 is a graph according to an exemplary embodiment of the inventive concept, which shows changes in input voltage and output current of the charging control circuit shown in FIG. 2 or FIG. 3.

4 and 8, the PC mode represents the precharge mode, the CC mode represents the constant current mode, and the CV mode represents the constant voltage mode. Although three modes of PC, CC and CV are shown in FIG. 8, the concept of the present invention is not limited to this. For example, the mode of the charging control circuit 309 may be two or four or more.

The output transistor PTR is fully turned on in response to the output signal CS (for example, the switch control signal CS) of the three-input amplifier 310, and the charging current control circuit 320 can control the charging current ICH in response to the control signals C1 to Ck. The control signal generator 335 can sense the voltage level of the charging voltage VBAT of the battery 370 connected to the output terminal ND4, and output control signals C1 to Ck having code values according to the sensing result.

In this case, each of the control signals C1 to Ck includes one or more bits, and the code value can be determined according to the bit value of each of the plurality of bits. For example, the bit value may include 1 (high level or logic 1) or 0 (low level or logic 0).

For example, when the charging voltage VBAT of the battery 370 connected to the output terminal ND4 in the PC mode is lower than the first voltage level (for example, 2.8 volts), the charging current control circuit 320 may control the charging current ICH so that the charging current The ICH has a first current level (for example, 20 mA) in response to the control signals C1 to Ck having the first code value. Since the charging current ICH having the first current level is supplied to the battery 370 via the output terminal ND4, the charging voltage VBAT can be charged at a second voltage level (for example, 3.0 volts) higher than the first voltage level.

At the first time T1, the control signal generator 335 can sense that the voltage level of the charging voltage VBAT of the battery 370 connected to the output terminal ND4 is the second voltage level (for example, 3.0 volts), and according to the sensing And output the control signals C1 to Ck with the second code value. In other words, the CC mode can be performed from the first time T1. In the CC mode, the charging current control circuit 320 can control the charging current ICH, The charging current ICH has a second current level (for example, 200 mA) in response to the control signals C1 to Ck having the second code value. Since the charging current ICH having the second current level is supplied to the battery 370 via the output terminal ND4, the charging voltage VBAT can be charged at a third voltage level (for example, 4.2 volts) higher than the second voltage level.

At the second time T2, the control signal generator 335 can sense that the voltage level of the charging voltage VBAT of the battery 370 connected to the output terminal ND4 is the third voltage level (for example, 4.2 volts), and according to the sensing And output the control signals C1 to Ck with the third code value.

In other words, the CV mode can be performed from the second time T2. In the CV mode, the charging current control circuit 320 can reduce the charging current ICH in response to the control signals C1 to Ck having the third code value. As shown in FIG. 8, the charging current ICH supplied to the battery 370 can be gradually reduced in response to the control signals C1 to Ck having the third code value. It should be understood that the third code value changes with time.

At the third time T3, for example, when the current level of the charging current ICH is equal to the first current level (for example, 20 mA), the control circuit 350 may output the rectifier control signal RCTRL to the rectifier circuit 305. Therefore, after the third time T3, according to the control of the control circuit 350, the enabled rectifier circuit 305 may be disabled, and the disabled communication circuit 340 may be enabled. For example, the operation mode of the second mobile device 300A or 300B can automatically switch from the wireless charging mode to the wireless communication mode.

4 again, the charging control circuit 309 may include a three-input amplifier 310, a charging current control circuit 320, an output transistor PTR, a sensing circuit 325, a plurality of resistors 330 and 332, and a control signal generator 335. A loop circuit can simultaneously control the charging voltage VBAT and the charging current ICH, and the loop circuit can include a three-input amplifier 310, a charging current control circuit 320, a sensing circuit 325, and a control signal generator 335.

The three-input amplifier 310 may be a three-input voltage amplifier; however, the three-input amplifier 310 is not limited to this. The three-input amplifier 310 can use input signals VREF, IFB, and VFB to generate an output signal CS, such as a switch control signal CS.

FIG. 9 is a schematic block diagram of the three-input amplifier shown in FIG. 4, and FIG. 10 is a detailed block diagram of the three-input amplifier shown in FIG. 9.

4, 9 and 10, the three-input amplifier 310 may include a constant current source 311, a multiplexer 313, and an amplifier 315. The constant current source 311 may be connected between the input terminal ND0 receiving the input voltage VIN and the second input terminal (for example, a positive input terminal) of the amplifier 315, and supply a constant current (for example, an operating current).

The multiplexer 313 can supply one of the first feedback voltage VFB and the second feedback voltage IFB to the second input terminal (+) of the amplifier 315. For example, the multiplexer 313 may be an analog switch or an analog multiplexer.

For example, when the first feedback voltage VFB is higher than the second feedback voltage IFB or is in a dominant position, the multiplexer 313 can supply the first feedback voltage VFB to the second input terminal (+) of the amplifier 315. When the second feedback voltage IFB is higher than the first feedback voltage VFB or is in a dominant position, the multiplexer 313 can reduce the second feedback voltage IFB It is supplied to the second input terminal (+) of the amplifier 315.

The amplifier 315 can amplify the voltage difference between the reference voltage VREF supplied to its first input terminal (for example, the negative input terminal) and the feedback voltage VFB or IFB supplied to its second input terminal (+), and output the corresponding The switch control signal CS as a result of the amplification.

Figure 10 shows amplifier 315 in more detail. For example, the amplifier includes two transistors 317-1 and 317-2 connected to a first input terminal (-), and a transistor connected between the first input terminal (-) and the second input terminal (+) Two transistors 316-1 and 316-2, and two current sources 321 and 331. The amplifier 315 further includes a plurality of transistors 318-1 to 318-8 connected between the input terminal and the output terminal.

The charging current control circuit 320 can control the charging current ICH output to the output terminal ND4 through the output transistor PTR in response to the switch control signal CS and the control signals C1 to Ck having code values.

The charging current control circuit 320 may include transistors 321-1 to 321-k (where k is a natural number of four or more) and switches 323-1 to 323-k. Whether each of the transistors 321-1 to 321-k is turned on or off can be controlled by the switch control signal CS, and whether each of the switches 323-1 to 323-k is on or off can be controlled Control of each of the signals C1 to Ck. When all the transistors 321-1 to 321-k are turned on, the size of the charging current control circuit 320 may depend on the number of switches 323-1 to 323-k that are turned on. For example, each of the switches 323-1 to 323-k may be a metal-oxide-semiconductor field-effect transistor (MOSFET).

For example, the size of the charging current control circuit 320 may be based on the channel width/length (W/L) ratio of at least one turned-on switch (or at least one transistor serially connected to at least one turned-on switch) to make sure. For example, the output current (for example, the sensing current I) of the charging current control circuit 320 in FIG. 4 can be expressed as Equation 1.

[Equation 1] I=ICH*N/M

Here, "N" represents the size of the charging current control circuit 320, and "M" represents the size of the output transistor, such as the width/length ratio. "N" may be a value that varies with the number of switches that are turned on, and "M" may be a fixed value.

For example, the size of the charging current control circuit 320 when the number of switches turned on is one is smaller than the size of the charging current control circuit 320 when the number of switches turned on is two or more. For example, the respective sizes (eg, width/length ratio) of the transistors 321-1 to 321-k may be the same or different from each other. In addition, the size of each of the transistors 321-1 to 321-k may be a weighted value. The number of switches turned on in the PC mode may be greater than the number of switches turned on in the CC mode. The charging current ICH when the value of N is small may be greater than the charging current ICH when the value of N is large.

The output transistor PTR can be turned on or off in response to the switching control signal CS output from the three-input amplifier 310. The size of the output transistor PTR (for example, the width/length ratio) can be much larger than the respective sizes of the transistors 321-1 to 321-k or the respective sizes of the metal oxide semiconductor field effect transistor switches 323-1 to 323-k .

The sensing circuit 325 can sense the sensing current I and the charging voltage VBAT at the same time. The sensing circuit 325 may include a comparator 327, a plurality of transistors 328-1 and 328-2, and a current mirror (329-1 and 329-2). For example, each of the transistors 328-1 and 328-2 may be an N-type metal oxide semiconductor field effect transistor.

The comparator 327 may include a positive input terminal (+) that receives the voltage of the connection node ND1, a negative input terminal (-) that receives the output voltage VBAT of the output node ND4, and is connected to the transistors 328-1 and 328-2 Each of the control terminals (eg, gate terminals) output terminals.

The comparator 327 can generate a voltage connected to the node ND1, which tracks or follows the output voltage VBAT. When the output voltage VBAT increases, the output voltage of the comparator 327 decreases and is supplied to the gate (or gate terminal) of each of the N-type metal oxide semiconductor field effect transistors 328-1 and 328-2 The control voltage of is reduced, whereby the current flowing in each of the N-type metal oxide semiconductor field effect transistors 328-1 and 328-2 is reduced. Therefore, the voltage of the connection node ND1 can be increased.

When the output voltage VBAT decreases, the output voltage of the comparator 327 decreases and the control voltage supplied to the gate of each of the N-type metal oxide semiconductor field effect transistors 328-1 and 328-2 increases, whereby This increases the current flowing in each of the N-type metal oxide semiconductor field effect transistors 328-1 and 328-2. Therefore, the voltage of the connection node ND1 can be reduced.

Transistors 329-1 and 329-2 can form current mirrors. The current mirror can generate a mirror current I that is the same as the sense current I. The resistor REXT is connected to the resistor connection terminal ND2. For example, the resistor REXT can perform the mirror current output from the current mirror I Converted to the function of the second feedback voltage IFB.

The resistors 330 and 332 may form a voltage divider. The voltage of the division node ND3 may be supplied to the three-input amplifier 310 as the first feedback voltage VFB.

The control signal generator 335 can sense the output voltage VBAT of the output node ND4 (for example, the charging voltage VBAT supplied to the battery 370), and generate control signals C1 to Ck having code values according to the sensing result. As mentioned above, the control signals C1 to Ck can be used to control the charging current ICH.

FIG. 5 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept. FIG. 6 shows a block diagram of the first mobile device and a block diagram of the second mobile device shown in FIG. 1 according to an exemplary embodiment of the inventive concept. FIG. 7 shows a block diagram of a charging control circuit included in the second mobile device shown in FIG. 5 or FIG. 6 according to an exemplary embodiment of the inventive concept.

Except for the charging control circuit 309C and the control circuit 350C, the second mobile device 300C shown in FIG. 5 is the same as or similar to the second mobile device 300A shown in FIG. 2 in structure and function. Different from the charging control circuit 309 shown in FIG. 4, the charging control circuit 309C shown in FIG. 7 does not include a control signal generator 335.

5 and 7, the control circuit 350C can sense the output voltage VBAT of the output node ND4 (in other words, the charging voltage VBAT supplied to the battery 370), and generate a control signal C1 having a code value according to the sensing result To Ck. As mentioned above, the control signals C1 to Ck can be used to control the charging current ICH. The control circuit 350C shown in FIG. 5 can perform the function of the control signal generator 335 shown in FIG. 4.

Except for the charging control circuit 309C and the control circuit 350D, the second mobile device 300D shown in FIG. 6 is the same as or similar to the second mobile device 300B shown in FIG. 3 in structure and function. 6 and 7, the control circuit 350D can sense the output voltage VBAT of the output node ND4 (for example, the charging voltage VBAT supplied to the battery 370), and generate a control signal C1 having a code value according to the sensing result To Ck. As mentioned above, the control signals C1 to Ck can be used to control the charging current ICH. The control circuit 350D shown in FIG. 6 can perform the function of the control signal generator 335 shown in FIG. 4.

FIG. 11 is a flowchart illustrating the operation of the second mobile device shown in FIG. 2 or FIG. 5 according to an exemplary embodiment of the inventive concept. 1, 2, 4, and 8 to 11, when the user of the second mobile device 300A selects the third graphical user interface 120, the user input 381 can be sent to the control circuit via the interface circuit 380 350. The control circuit 350 can receive and interpret (or analyze) the user input 381 received via the interface circuit 380.

When the user inputs 381 to select the charging mode for wireless charging ("Yes" in S110), the second mobile device 300A can operate in the charging mode. In other words, in the charging mode, the control circuit 350 can generate the rectifier control signal RCTRL for energizing the rectifier circuit 305, and disable the communication circuit 340 (S120).

The charging control circuit 309 can control the level of the input voltage VIN so that the level of the output voltage VIN of the rectifier circuit 305 (for example, the level of the input voltage VIN of the charging control circuit 309) tracks the level of the charging voltage VBAT of the battery 370 ( S130). In addition, the charging control circuit 309 can control the charging current ICH (S130).

The control circuit 350 can monitor whether the charging is completed based on the level of the charging voltage VBAT, and when the charging is completed ("Yes" in S150), the control circuit 350 can generate a rectifier control signal RCTRL for disabling the rectifier circuit 305 and The communication circuit 340 is energized (S140). When the charging is not completed (No in S150), the charging control circuit 309 can perform step S130 again.

When the user inputs 381 to select the communication mode for wireless communication ("No" in S110), the second mobile device 300A can operate in the communication mode. In other words, in the communication mode, the control circuit 350 can generate the rectifier control signal RCTRL for disabling the rectifier circuit 305, and enable the communication circuit 340 (S140).

FIG. 12 is a flowchart illustrating the operation of the second mobile device shown in FIG. 3 or FIG. 6 according to an exemplary embodiment of the inventive concept. 1, 3, 4, 6 to 10, and 12, when the user of the first mobile device 200B selects the first graphical user interface 110, the user input 271 is transmitted through the interface circuit 270 To control circuit 260. The modulation circuit 220 transmits a wireless signal for wireless charging through the antenna 240.

The communication circuit 340B of the second mobile device 300B can receive the transmitted signal (for example, an AC signal) obtained by the antenna 301 (S210), interpret (or analyze) the transmitted signal (for example, the AC signal), and combine the The translation (or analysis) result is transmitted to the control circuit 350 (S220). According to an exemplary embodiment of the inventive concept, the communication circuit 340B can directly transmit the transmitted signal (for example, AC signal) obtained by the antenna 301 to the control circuit 350, and the control circuit 350 can determine that the transmitted signal is used for wireless charging The signal is also a signal used for wireless communication.

When the user inputs 271 to select the charging mode for wireless charging ("Yes" in S230), the second mobile device 300B can operate in the charging mode. In other words, in the charging mode, the control circuit 350 can generate the rectifier control signal RCTRL for energizing the rectifier circuit 305, and disable the communication circuit 340B (S240). The charging control circuit 309 can control the level of the input voltage VIN so that the level of the output voltage VIN of the rectifier circuit 305 (for example, the level of the input voltage VIN of the charging control circuit 309) tracks the level of the charging voltage VBAT of the battery 370 ( S240). In addition, the charging control circuit 309 can control the charging current ICH (S240).

The control circuit 350 can monitor whether the charging is completed based on the level of the charging voltage VBAT, and when the charging is completed ("Yes" in S260), the control circuit 350 can generate a rectifier control signal RCTRL for disabling the rectifier circuit 305 and The communication circuit 340B is energized (S250). When the charging is not completed ("No" in S260), the charging control circuit 309 may perform step S240 again.

When the user inputs 271 to select the communication mode for wireless communication ("No" in S230), the second mobile device 300B can operate in the communication mode. In other words, in the communication mode, the control circuit 350 can generate the rectifier control signal RCTRL for disabling the rectifier circuit 305, and enable the communication circuit 340B (S250).

FIG. 13 is a flowchart illustrating the operation of the second mobile device shown in FIG. 2 or FIG. 5 according to an exemplary embodiment of the inventive concept. 11 and FIG. 13, except for step S130-1, steps S110, S120, S140, and S150 shown in FIG. 13 are the same as or similar to steps S110, S120, S140, and S150 shown in FIG.

In other words, in the charging mode (S120), the second mobile device 300A, 300B, 300C, or 300D can control the level of the input voltage VIN while communicating with the first mobile device 200A or 200B, so that the level of the output voltage VIN of the rectifier circuit 305 (for example, the input voltage VIN of the charging control circuit 309 or 309C The level of the charging voltage VBAT of the battery 370 is tracked (S130-1). In addition, the charging control circuit 309 or 309C can control the charging current ICH (S130-1).

Although it is shown in FIG. 13 that step S130-1 is performed in the charging mode, the concept of the present invention is not limited to this. For example, the second mobile device 300A, 300B, 300C, or 300D can perform charging operation and communication operation in the communication mode simultaneously or in parallel (S140).

FIG. 14 is a flowchart illustrating the operation of the mobile device shown in FIG. 3 or FIG. 6 according to an exemplary embodiment of the inventive concept. 12 and 14, except for step S240-1, steps S210, S220, S250, and S260 shown in FIG. 14 are the same as or similar to steps S210, S220, S250, and S260 shown in FIG.

In other words, in the charging mode (S230), the second mobile device 300A, 300B, 300C, or 300D can control the level of the input voltage VIN while communicating with the first mobile device 200A or 200B, so that the output voltage VIN of the rectifier circuit 305 The level (for example, the level of the input voltage VIN of the charging control circuit 309 or 309C) tracks the level of the charging voltage VBAT of the battery 370 (S240-1). In addition, the charging control circuit 309 or 309C can control the charging current ICH (S240-1).

Although it is shown in FIG. 14 that step S240-1 is performed in the charging mode, the concept of the present invention is not limited to this. For example, the second mobile device 300A, 300B, 300C or 300D can be charged simultaneously or in parallel in the communication mode And communication operation (S250).

15 shows a block diagram of a wireless charging system according to an exemplary embodiment of the inventive concept. The wireless charging system includes a mobile device that can be charged using a wireless signal output from the first mobile device shown in FIG. 1. 1-15, the wireless charging system may include a mobile device 401, which includes a first mobile device (200A or 200B, collectively referred to as 200) and a second mobile device (300A, 300B, 300C, or 300D, collectively referred to as 300). ).

For example, the wireless charging system may be an IoT network system, and the mobile device 401 may be a wearable IoT device.

The wearable IoT device 401 may include smart glasses 401-1, earphones 401-2, electrocardiogram measuring instrument (electrocardiogram (ECG)/photoplethysmography (PPG) measuring instrument) 401-3, belt 401-4, second mobile device 300 (for example, wristband or watch), blood glucose meter 401-6, temperature-controlled clothes 401-7, shoes 401-8, and necklace 401-9.

Each of the wearable IoT devices 401 may include a sensor that senses the health status of the user 403, the surrounding environment, and/or user commands. Each of the wearable IoT devices 401 may include the components 301, 303, 305, 307, 309, 340, 350, and 385 described with reference to FIGS. 1 to 14, and may further include a component 380. According to an exemplary embodiment of the inventive concept, the component 309 or 340 may be replaced with the component 309C or 340B.

For example, each of the wearable IoT devices 401 may be the same as or similar to the actions described with reference to FIG. 2, FIG. 3, FIG. 5, or FIG. 6 in structure and function Device 300A, 300B, 300C or 300D. For example, the first mobile device 200 that can perform the function of a host device or a hub can transmit data to each of the wearable IoT devices 401 or each of the self-wearable IoT devices 401 via a wireless communication protocol The person receives the information.

The first mobile device 200 can transmit electrical stimulation information to the smart glasses 401-1, and the electrical stimulation information can treat abnormal brain waves of the user 403 based on the brain wave information of the user 403.

The earphone 401-2 includes a temperature sensor, an image sensor, and/or a touch sensor, and at least one of these sensors can be used to sense physical information about the user 403, and the sensed The measured information is sent to the first mobile device 200.

The electrocardiogram measuring instrument 401-3 or the photoplethysmography measuring instrument 401-3 can measure the electrocardiogram of the user 403, and transmit the measurement result to the first mobile device 200.

The belt 401-4 may include a sensor that can measure the waist circumference, respiratory function, and/or obesity of the user 403, and includes a vibration function or electrical stimulation function for treating obesity or pain. The second mobile device 300 may include a sensor that can measure temperature, pressure and/or ultraviolet light. The continuous blood glucose meter (eg, blood glucose concentration tester 401-6) may include a blood glucose sensor for measuring the blood glucose of the user 403. The blood glucose measurement sensor may be a non-invasive sensor. The measured blood glucose concentration can be transmitted to the service provider via the first mobile device 200.

The temperature-controlled clothing 401-7 may include a sensor that can measure the temperature of the user 403 or the surrounding temperature. Temperature controlled clothes 401-7 can set the temperature The measured temperatures are compared, and the cooling function or heating function of the temperature-controlled clothes 401-7 is controlled according to the result of the comparison. For example, the temperature-controlled clothing 401-7 may be a baby diaper, an adult diaper, or underwear. The diaper or underwear may include a skin conduction sensor, a temperature sensor, a test strip sensor, or a pressure sensor. This sensor is used to sense the state of the user 403 and notify the user 403 of the change of the diaper or underwear Time or cooling or heating the user 403. The diaper or underwear can be embedded with heating coils or cooling tubes for cooling or heating.

The shoe 401-8 may include a sensor that senses the weight of the user 403, regional plantar pressure, air pollution, humidity, or the smell of the shoe, or a global positioning system (GPS) sensor. The information collected from the sensor can be transmitted to the first mobile device 200. The first mobile device 200 can provide the user 403 with information about the time to correct his posture, to clean the shoes, or to change the shoes.

The necklace 401-9 can be installed around the neck of the user 403, and includes sensing the user 403's breathing, pulse, temperature, momentum, calories consumed, GPS, brain wave measurement, sound, ECG or PPG. Detector. The information collected from the sensor can be analyzed autonomously by the necklace 401-9 or can be transmitted to the first mobile device 200. The service provider may provide related services to the first mobile device 200 based on the information output from the first mobile device 200 (for example, the sensed information and user information).

FIG. 16 shows a block diagram of a wireless charging system according to an exemplary embodiment of the inventive concept. The wireless charging system includes a mobile device that can be charged using a wireless signal output from the first mobile device shown in FIG. 1. Refer to Figure 1 to Figure 14 and 16, a wireless charging system 500 (for example, a wireless sensor network (WSN) system) may include a first mobile device 200 and wearable IoT devices 300, 510, 520, 530, 540, 550, 560, 570 and 580. Each of the wearable IoT devices 510 to 580 may be the same as or similar to the mobile device 300 described with reference to FIGS. 1 to 14 in structure and operation. For example, the first Internet of Things device 300 is a smart watch, the second Internet of Things device 510 is a sleep sensor that senses sleep, the third Internet of Things device 520 is a calorie sensor, and the fourth Internet of Things device 530 is a blood sugar sensor. The fifth IoT device 540 is a fall detection sensor, the sixth IoT device 550 is a stress detection sensor, and the seventh IoT device 560 is an oxygen saturation sensor (for example, a peripheral capillary Oxygen saturation-SpO2), the eighth IoT device 570 is a skin temperature sensor, and the ninth IoT device 580 is a pedometer.

Each of the wearable IoT devices 300, 510, 520, 530, 540, 550, 560, 570, and 580 can use the wireless signal output from the first mobile device 200 for wireless charging.

The charging control circuit according to the exemplary embodiment of the inventive concept can be embedded in a small area and has high charging efficiency without including a step-down switching DC-DC converter. Therefore, the size of the device including the charge control circuit can be reduced.

The device including the charging control circuit according to the exemplary embodiment of the inventive concept can use the wireless signal output from the mobile device to wirelessly charge the battery included in the device, so that the user of the device does not need to carry an additional charging device. For example, when the mobile device is a smart phone, the device including the charging control circuit The device can use the wireless signal output from the mobile device to wirelessly charge its battery.

Although the concept of the present invention has been specifically illustrated and explained with reference to the exemplary embodiments of the concept of the present invention, those with ordinary knowledge in the art should understand that the scope of the present invention is not deviated from the scope defined by the scope of the patent application below. Next, various forms and details can be changed.

309: charge control circuit/component

310: Three-input amplifier

320: charging current control circuit

321-1~321-3, 321-k: Transistor

323-1~323-3, 323-k: switch/metal oxide semiconductor field effect transistor switch

325: sensing circuit

327: Comparator

328-1, 328-2: Transistor/N-type metal oxide semiconductor field effect transistor

329-1, 329-2: Transistor

330: resistor/resistor

332: resistor/resistor

335: control signal generator

370: battery/component

C1~C3, Ck: control signal

CS: output signal/switch control signal

I: sense current/mirror current

ICH: charging current

IFB: Input signal/second feedback voltage

ND0: Input terminal

ND1: Connect node

ND2: Resistor connection terminal

ND3: Divide nodes

ND4: output terminal/output node

PTR: output transistor

REXT: resistance/resistor

VBAT: output voltage/charge voltage

VFB: Input signal/first feedback voltage

VIN: output voltage/input voltage

VREF: Reference voltage/input signal

Claims (23)

A charging control circuit includes: a charging current control circuit for receiving an input voltage at a first node, outputting a sensed current to a second node, and turning on a power transistor, wherein the output voltage of the power transistor is directly Input to the battery; a comparator for comparing the voltage level of the second node with the voltage level of the third node, wherein the third node receives the charging current from the power transistor; a current mirror is used To generate a mirror current corresponding to the sensing current; and an amplifier for receiving a first feedback voltage based on the mirror current, and amplifying the difference between the first feedback voltage and a reference voltage to generate a switch A control signal, wherein in response to the switch control signal and a plurality of control signals, the charging current control circuit is used to reduce the sensing current and turn on the power transistor, wherein the plurality of control signals are self-contained The control circuit is provided to the charging control circuit. The charging control circuit according to the first item of the scope of patent application, wherein the charging current control circuit includes a plurality of transistors and a plurality of switches. In the charging control circuit described in item 2 of the scope of patent application, the number of the transistors to be turned on depends on the plurality of control signals. According to the charging control circuit described in claim 3, the value of the plurality of control signals depends on the voltage level at the third node. The charging control circuit as described in item 4 of the scope of patent application, wherein when the sensing current decreases, the voltage of the switch control signal decreases. The charging control circuit described in item 5 of the scope of patent application, wherein when the voltage of the switch control signal decreases, the power transistor is completely turned on. The charging control circuit according to the first item of the scope of patent application, wherein the output of the comparator is provided to the current mirror via a plurality of transistors. The charging control circuit according to the first item of the scope of patent application, wherein the amplifier includes a multiplexer, a first input terminal for receiving the reference voltage, and a second input for receiving the first feedback voltage Terminal, a third input terminal for receiving the second feedback voltage, and a comparator. The charging control circuit according to item 8 of the scope of patent application, wherein the first feedback voltage is greater than the second feedback voltage, and the first feedback voltage is transmitted to the comparison via the multiplexer The input terminal of the converter is compared with the reference voltage. The charging control circuit described in item 8 of the scope of patent application, wherein the first feedback voltage is transmitted in a constant current mode via the multiplexer. The charging control circuit as described in item 1 of the scope of the patent application further includes: a control signal generator connected to the output terminal of the power transistor and used to respond to the voltage at the output terminal of the power transistor And generate a control signal. The charging control circuit according to claim 1, wherein the input voltage has a first current level, and the sensing current has a greater than that of the first current level. The second current level of the current level, and the first current level of the input voltage causes the power transistor to be partially turned on. The charging control circuit according to claim 12, wherein the power transistor is completely turned on by reducing the sensing current, wherein the power transistor is turned on by reducing the charging current control circuit The number of crystals reduces the sensing current. A charging control circuit for supplying a charging voltage to a battery, the charging control circuit comprising: an input terminal for receiving the input voltage from a rectifier circuit; an output terminal connected to the battery; a power transistor, the power transistor The output terminal is connected to the output terminal to directly provide the charging voltage to the battery; a comparator having a first input terminal connected to the power transistor and a second node connected to the charging current control circuit Input terminal, wherein the sensing current of the charging current control circuit is input to the first input terminal of the comparator via the node; a current mirror is connected to the output terminal of the comparator and used to generate The mirror current of the sensing current; and an amplifier for receiving a reference voltage, a first feedback voltage, and a second feedback voltage, and the amplifier is based on the difference between the reference voltage and the first feedback voltage Or the difference between the reference voltage and the second feedback voltage to output a switch control signal, The charging control circuit is used to control the input voltage so that the input voltage tracks the charging voltage. The charging control circuit according to claim 14, wherein the charging current control circuit includes a plurality of transistors, and the plurality of transistors are turned on in response to the switch control signal. The charging control circuit according to claim 14, wherein the charging current control circuit includes a plurality of switches, and the plurality of switches are turned on in response to a control signal provided by a self-control signal generator. The charging control circuit described in item 14 of the scope of patent application further includes at least one transistor connected between the output terminal of the comparator and the current mirror. The charging control circuit according to claim 17, wherein the input terminal of the at least one transistor is connected to the node of the charging current control circuit, and the control terminal of the at least one transistor is connected to the The output terminal of the comparator. The charging control circuit described in item 14 of the scope of patent application, wherein the second feedback voltage is generated by a voltage divider connected to the power transistor. The charging control circuit according to claim 14, wherein the amplifier includes a multiplexer for supplying the first feedback voltage when the first feedback voltage is greater than the second feedback voltage. One feedback voltage to the comparison circuit. As described in item 14 of the scope of patent application, the charging control circuit further includes: a control signal generator connected to the power transistor and used for The charging voltage provided by the power transistor generates a control signal. A charging device includes: a rectifier circuit for rectifying an AC signal received by the device into a DC signal and outputting the DC signal as an input voltage; a charging control circuit for outputting a charging voltage based on the input voltage, Wherein the charging control circuit is directly connected to the rectifier circuit to receive the input voltage, and wherein the input voltage is controlled by the charging control circuit to track the charging voltage during a charging cycle; and a control circuit for To control the rectifier circuit, the charging control circuit includes: a charging current control circuit for receiving the input voltage, outputting a sensing current, and turning on a power transistor, wherein the output voltage of the power transistor is directly input to A battery; and an amplifier for receiving a first feedback voltage and amplifying the difference between the first feedback voltage and a reference voltage to generate a switch control signal, wherein the control circuit provides a control signal to the charging control Circuit. The charging device described in item 22 of the scope of patent application further includes a matching circuit for receiving power from a smart phone in a wireless manner.

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